diff --git a/jar/jar.rb b/jar/jar.rb
new file mode 100644
index 0000000..42490e2
--- /dev/null
+++ b/jar/jar.rb
@@ -0,0 +1,6 @@
+require 'warbler'
+jar = Warbler::Jar.new
+jar.files["directory"] = nil # directory entry
+jar.files["inline.txt"] = StringIO.new("in memory")
+jar.files["path/a.txt"] = "a.txt" # disk file
+jar.create("sample.jar")
diff --git a/jar/sample.jar b/jar/sample.jar
new file mode 100644
index 0000000..bbb6b5a
Binary files /dev/null and b/jar/sample.jar differ